Mark sockets on creation (socket()) and accept4().

Remove the separate syscall for accept() and implement it as accept4(..., 0).

Change-Id: Ib0b8f5d7c5013b91eae6bbc3847852eb355c7714
diff --git a/libc/bionic/accept4.cpp b/libc/bionic/accept4.cpp
new file mode 100644
index 0000000..9f58dc1
--- /dev/null
+++ b/libc/bionic/accept4.cpp
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "private/NetdClientDispatch.h"
+
+#include <sys/socket.h>
+
+int accept4(int sockfd, sockaddr* addr, socklen_t* addrlen, int flags) {
+    return __netdClientDispatch.accept4(sockfd, addr, addrlen, flags);
+}